8-Step Sequencer with voltage controllable pattern (VCPS)

diablojoy · Posted: Mon Aug 23, 2010 6:28 am Post subject:

and a second noodle from exactly the same patch with just a few changes of settings [different clocking and the coarse offset changed]

vcps seq test 2.mp3

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emdot_ambient · Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD

diablojoy · Posted: Mon Aug 23, 2010 4:42 pm Post subject:

TekniK · Joined: Aug 10, 2008 Posts: 1059

with a proper silkscreen or engraving your modules would be more as awesome

Very machine looking devices,i like them very much

diablojoy · Posted: Mon Aug 23, 2010 10:18 pm Post subject:

thanks TeKniK
will be doing something along those lines haven't quite decided
what exactly as yet though I am leaning towards white with blue lettering
also note that is only a temp timber case for testing shown the real ones are still under construction also in wood but very organic looking lumpy and bent like bananas haha very labour intensive !
hence the vertical not quite 19 inch format 50mm width increments not the norm, material is easier to obtain and cheaper that way

fonik · Posted: Wed Aug 25, 2010 8:34 am Post subject:

DamDuram · Joined: Jul 14, 2010 Posts: 4 Location: Duesseldorf

i want to order 2 pcb´s , please.

greetings

oldmanfury · Joined: Oct 20, 2006 Posts: 57 Location: CA

I finished up my VCPS8 this morning. The project documentation was great, although I recommend revising the comment

"MOTM Style Connector +15V / GND / -15V nothing special to take care about."

to "Unlike PCB graphics take care to place the tab on the bottom!"

I went with 2-color 2.5 mm LED's to save some space - I like this option. Since I used jacks on the board, I can swap S_LED and P_LED, depending on whether I want green/orange or red/orange LED's to show each step.

Works fine - except for one oddity... mine "boots up" funny every other time I power up. It shows active steps (LED's are lit) , but is unresponsive to the offset/fine/CV control. Cycle the power and it usually wakes up fine. Any ideas on this?

-gerald

http://buzzville.typepad.com/oldmanfury/2010/09/fonitronik-voltage-controlled-pattern-sequencer-8-vcps8.html

VCPS8.jpg

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fonik · Posted: Sun Sep 26, 2010 10:16 am Post subject:

unterbit

Dear Matthias !
I would take 1(VCPS) psb,+2ring mod=comb.shipping?
Please confirm.
Oleg

oldmanfury · Joined: Oct 20, 2006 Posts: 57 Location: CA

Skrog Productions · Posted: Sun Sep 26, 2010 3:28 pm Post subject:

I have that problem with a stuck clock on power up sometimes , i got round it by using a double pole momentary push to break switch , press it to break the supply a couple of times then good to go Very Happy

, that's perhaps a lazy way to fix it , but works great for me Smile

Dave.

fonik · Posted: Mon Sep 27, 2010 8:13 am Post subject:

dave, which ADC did you use?
(the ADC0801 provides an internal clock. however according to datasheet one would then need a 'start'-switch circuitry. so i went for an external clock for the ADC just to prevent the need of such an additional switch!)

oldmanfury · Joined: Oct 20, 2006 Posts: 57 Location: CA

Looks like you're onto something here - the data sheet for the DAC I used says :
"The device may be operated in the free−running mode by connecting
INTR to the WR input with CS = 0. To insure start−up under all possible conditions, an external WR pulse is required during the first power−up cycle."

Skrog Productions · Posted: Thu Sep 30, 2010 11:55 am Post subject:

Hi Mattias , i used the ADC0804 from Farnel uk , just occasionally it sticks on step 8 at start up with all adc switches on, i had a look at the data sheet and i see the momentary grounding WR diagram , i'll try catching it under fault & test the clock feed.

Dave.

fonik · Posted: Thu Sep 30, 2010 11:14 pm Post subject:

LektroiD · Posted: Sat Oct 02, 2010 7:14 pm Post subject:

Edit - double post Embarassed

LektroiD · Posted: Sat Oct 02, 2010 7:15 pm Post subject:

Would a BZY88 (5V1) be ok in place of Z1?

fonik · Posted: Sun Oct 03, 2010 11:40 pm Post subject:

LektroiD · Posted: Wed Oct 06, 2010 9:32 am Post subject:

Hi a couple of questions;

1, can these work linked to make 16 steps? I'm thinking of building 2 into a single panel.

2, I'm in the process of ordering the 40xx series ICs, there seems to be many variants and some appear to have different functions, they all have different suffixes, which are recommended for each?

..I have some 40xx series ICs in my collection, but they are not prefixed with 'CD', is this essential?

Thanks in advance

fonik · Posted: Thu Oct 07, 2010 2:41 am Post subject:

XCenter · Joined: Oct 01, 2005 Posts: 113 Location: Germany

I´d just add a sequential switch circuit in front of both gate/trigger-ins to route the incoming clock. That way both VCPSs should be "addressed" one after another. Question

fonik · Posted: Thu Oct 07, 2010 3:42 am Post subject:

this and a divider upfront, and a mixer downstream.

i mean, it is called "modular"... Very Happy

XCenter · Joined: Oct 01, 2005 Posts: 113 Location: Germany

werock · Joined: Oct 12, 2010 Posts: 3 Location: London